Nano Research

, Volume 12, Issue 11, pp 2749–2759 | Cite as

Enhanced CH4 selectivity in CO2 photocatalytic reduction over carbon quantum dots decorated and oxygen doping g-C3N4

  • Qian Li
  • Songcan Wang
  • Zhuxing Sun
  • Qijun Tang
  • Yiqiu Liu
  • Lianzhou WangEmail author
  • Haiqiang WangEmail author
  • Zhongbiao Wu
Research Article


Graphitic carbon nitride (g-C3N4, CN) exhibits inefficient charge separation, deficient CO2 adsorption and activation sites, and sluggish surface reaction kinetics, which have been recognized as the main barriers to its application in CO2 photocatalytic reduction. In this work, carbon quantum dot (CQD) decoration and oxygen atom doping were applied to CN by a facile one-step hydrothermal method. The incorporated CQDs not only facilitate charge transfer and separation, but also provide alternative CO2 adsorption and activation sites. Further, the oxygen-atom-doped CN (OCN), in which oxygen doping is accompanied by the formation of nitrogen defects, proves to be a sustainable H+ provider by facilitating the water dissociation and oxidation half-reactions. Because of the synergistic effect of the hybridized binary CQDs/OCN addressing the three challenging issues of the CN based materials, the performance of CO2 photocatalytic conversion to CH4 over CQDs/OCN-x (x represents the volume ratio of laboratory-used H2O2 (30 wt.%) in the mixed solution) is dramatically improved by 11 times at least. The hybrid photocatalyst design and mechanism proposed in this work could inspire more rational design and fabrication of effective photocatalysts for CO2 photocatalytic conversion with a high CH4 selectivity.


photocatalytic CO2 reduction graphitic carbon nitride (g-C3N4carbon quantum dot oxygen doping 


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This research is financially supported by the National Natural Science Foundation of China (No. 51578488), Zhejiang Provincial “151” Talents Program, the Program for Zhejiang Leading Team of S&T Innovation (No. 2013TD07) and Changjiang Scholar Incentive Program (Ministry of Education, China, 2009).

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Enhanced CH4 selectivity in CO2 photocatalytic reduction over carbon quantum dots decorated and oxygen doping g-C3N4


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Copyright information

© Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Qian Li
    • 1
    • 2
  • Songcan Wang
    • 3
  • Zhuxing Sun
    • 4
  • Qijun Tang
    • 1
    • 2
  • Yiqiu Liu
    • 1
    • 2
  • Lianzhou Wang
    • 3
    Email author
  • Haiqiang Wang
    • 1
    • 2
    Email author
  • Zhongbiao Wu
    • 1
    • 2
  1. 1.Key Laboratory of Environment Remediation and Ecological Health, Ministry of Education, College of Environmental and Resources ScienceZhejiang UniversityHangzhouChina
  2. 2.Zhejiang Provincial Engineering Research Center of Industrial Boiler and Furnace Flue Gas Pollution ControlHangzhouChina
  3. 3.Nanomaterials Centre, School of Chemical Engineering and Australian Institute for Bioengineering and NanotechnologyThe University of QueenslandBrisbaneAustralia
  4. 4.School of Environmental Science and EngineeringShanghai Jiao Tong UniversityShanghaiChina

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